TW201339609A - Power supply test system - Google Patents

Abstract

A power supply test system for testing a power supply includes a control input module, a voltage regulating module and a load regulating module. The control input module includes at least one switch for setting a test current. The control input module outputs a PWM signal according to the test current set by the switch. The voltage regulating module receives the PWM signal, and outputs a first DC voltage of a special value and direction which is provided to the load regulating module. The load regulating module receives the first DC voltage, and adjust an output current of the power supply according to the first DC voltage.

Description

Power test system

The invention relates to a power supply test system, in particular to a power supply test system capable of uniformly adjusting an access electronic load.

As the "power system" of PC (Personal Computer), the power system provides the necessary power for the motherboard, keyboard, mouse, system clock, software switch, and remote wake-up of the PC network. The performance of the power system is to improve the PC. One of the keys to the availability and reliability of the complete system.

Therefore, it is especially necessary to carry out rigorous testing on the PC power supply. Usually, the power supply needs to perform an OCP (Over Current Protection) test. The so-called OCP test is to evenly connect the electronic load to be connected to the power supply to be tested. Increase, thereby increasing the load current of the power supply to be tested, thereby verifying that the power supply to be tested automatically powers off when carrying a large load current. The OCP test of the prior art is to increase the electronic load by manually rotating the adjustment knob of the electronic load, and manually adjusting the abnormality of the test waveform due to the uneven rotation speed, and the current value of the power supply to be tested in the event of automatic power failure cannot be accurately observed. , which in turn affects the accuracy of the test results.

In view of the above, it is necessary to provide a power supply test system capable of uniformly adjusting the access electronic load to accurately test the current value when the power supply to be tested is automatically powered off.

A power supply testing system for performing an overcurrent protection test on a power supply system includes a control input module, a voltage regulation module, and a load adjustment module, the control input module including at least one switch And a corresponding test current is provided, the control input module outputs a pulse width modulation signal according to the test current selected by the switch, the voltage adjustment module receives the pulse width modulation signal, and outputs a specific size according to the pulse width modulation signal. The first DC voltage of the direction supplies power to the load regulation module, and the load adjustment module receives the first DC voltage, and adjusts a load of the power supply according to the first DC voltage to adjust a current thereof.

Compared with the prior art, the power supply test system outputs a pulse width modulation signal according to the test current selected by the switch, and the voltage adjustment module receives the pulse width modulation signal and modulates the signal according to the pulse width modulation signal. Outputting a first DC voltage of a specific size and direction to supply power to the load regulation module, the load adjustment module receiving the first DC voltage, and adjusting a load of the power supply according to the first DC voltage to adjust a current thereof, A precise adjustment of the power supply to the load is achieved.

Referring to FIG. 1 , a preferred embodiment of the power test system of the present invention is used for performing an overcurrent protection test on a power supply device 500. The power test system includes a control input module 100, a voltage regulation module 200, and a The load regulation module 300 and a power supply module 400. The control input module 100 includes at least one switch and a corresponding test current. The control input module 100 outputs a pulse width modulated signal according to the test current selected by the switch. The voltage regulation module 200 receives the pulse width modulation signal, and outputs a first DC voltage of a specific size and direction according to the pulse width modulation signal to supply power to the load adjustment module 300. The load regulation module 300 receives the first DC voltage and adjusts the load of the power supply 500 according to the first DC voltage to adjust its current. The power supply module 400 provides an operating voltage for the control input module 100 and the voltage regulation module 200.

Referring to FIG. 2, the control input module 100 includes a microcontroller U1 and a plurality of switches S0~S3. The microcontroller includes a plurality of current signal input terminals PA0~PA3, a pulse width modulated signal output terminal PB0 and a control signal output terminal PC0. One end of the switch S0~S3 is electrically connected to the current signal input terminals PA0~PA3, and the other end of the switch S0~S3 receives a second DC voltage. The switch S0~S3 is a push button switch, and the size of the second DC voltage is +5V.

The voltage regulating module 200 includes a voltage regulating chip U2 and a transistor T. The voltage regulating chip U2 includes a first control signal input terminal IN1, a second control signal input terminal IN2, a pulse width modulation signal input terminal EXA, a first output terminal OUT1 and a second output terminal OUT2. The first control signal input terminal IN1 receives the second DC voltage via a first resistor R1. The second control signal input terminal IN2 is electrically connected to the control signal output terminal PC0. The base of the transistor Q is electrically connected to the control signal output terminal PC0 via a second resistor R2. The collector of the transistor Q is electrically connected to the first control signal input terminal IN1. The emitter of the transistor Q is grounded. The pulse width modulation signal input terminal EXA is electrically connected to the pulse width modulation signal output terminal PB0. The first output terminal OUT1 and the second output terminal OUT2 output the first DC voltage. Wherein, the transistor Q is an NPN type transistor. The potential of the first output terminal OUT1 is consistent with the potential of the first control signal input terminal IN1, and the potential of the second output terminal OUT2 is equal to the potential of the second control signal input terminal IN2.

The load regulation module 300 includes a motor A and a plurality of LEDs D1 D D4. The motor A is electrically connected to the first output terminal OUT1, and the other end of the motor A is electrically connected to the second output terminal OUT2 to receive the first DC voltage. The cathode of the diode D1 is electrically connected to one end of the motor A and the anode of the diode D4. The anode of the diode D1 is grounded. The cathode of the diode D4 receives the second DC voltage. The cathode of the diode D3 is electrically connected to the other end of the motor A and the anode of the diode D2. The anode of the diode D3 is grounded. The cathode of the diode D2 receives the second DC voltage.

The power supply module 400 includes a step-down circuit 401, a rectifier circuit 402, and a voltage stabilizing chip U3. The step-down circuit 401 includes a fuse F and a transformer T. The rectifier circuit 402 includes four diodes connected end to end. The regulator chip U3 includes an input terminal, an output terminal and a ground terminal. The step-down circuit 401 receives an AC voltage of 220V, and outputs the AC voltage to an AC voltage of 16V. The rectifier circuit 402 receives an AC voltage of 16V and converts it to a DC voltage of +16V. The input terminal of the regulator chip U3 receives a DC voltage of +16V, and outputs a stable second DC voltage at the output terminal to supply power to the microcontroller U1 and the voltage regulating chip U2.

In operation, the motor A is mated with the load regulating end of the power supply 500. Pressing the push button switches S0 to S2 selects the size of the power supply 500 to be connected to the load, thereby setting the speed of the output current of the power supply 500. The speed increase of the output current of the power supply 500 when the push button switches S0 to S2 is pressed is 10 A/S, 1 A/S, and 0.1 A/S, respectively, and the motor A rotates in the forward direction. When the push button switch S3 is pressed, the output current of the power supply 500 is reset at a fixed speed, and the rotation direction of the motor A is reversed.

When one of the button switches S0~S2 is pressed, the microcontroller U1 outputs a corresponding pulse width modulation signal at the pulse width modulation signal output terminal PB0 according to the received test current, and at the control signal output end. PC0 outputs a low potential control signal. The transistor Q is turned off. At this time, the first control signal input terminal IN1 is at a high potential, and the second control signal input terminal IN2 is at a low potential. The first output terminal OUT1 is at a high potential, and the second output terminal OUT2 is at a low potential. The voltage regulating chip U2 outputs a forward voltage of a corresponding magnitude at the first output terminal OUT1 and the second output terminal OUT2 according to the received pulse width modulation signal. The motor A receives the forward voltage and rotates at a corresponding speed to adjust the magnitude of the load connected to the power supply 500, thereby adjusting the speed of the output current of the power supply 500.

When the button switch S3 is pressed, the microcontroller U1 outputs a corresponding pulse width modulation signal at the pulse width modulation signal output terminal PB0, and outputs a high potential control signal at the control signal output terminal PC0. The transistor Q is turned on. At this time, the first control signal input terminal IN1 is at a low potential, and the second control signal input terminal IN2 is at a high potential. The first output terminal OUT1 is at a low potential, and the second output terminal OUT2 is at a high potential. The voltage regulating chip U2 outputs a reverse voltage of a corresponding magnitude at the first output terminal OUT1 and the second output terminal OUT2 according to the received pulse width modulation signal. The motor A receives the reverse voltage and rotates at a corresponding speed to adjust the magnitude of the power supply 500 access load, thereby resetting the power supply 500 output current for the next test.

The power supply test system of the present invention outputs a pulse width modulated signal by the control input module 100 according to the test current selected by the switches S0 to S3. The voltage regulation module 200 receives the pulse width modulation signal, and outputs a first DC voltage of a specific size and direction according to the pulse width modulation signal to supply power to the load adjustment module 300. The load regulation module 300 receives the first DC voltage, and adjusts the load of the power supply 500 according to the first DC voltage to adjust the current thereof, thereby achieving precise adjustment of the power supply 500 to the load.

In summary, the present invention is in accordance with the conditions of the invention patent application, and the patent application is filed according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art to the spirit of the present invention should be included in the following claims.

100. . . Control input module

200. . . Signal input module

300. . . Signal acquisition module

400. . . Decoding module

500. . . Display module

600. . . Alarm module

800. . . Power Supplier

S0~S9. . . power switch button

Q. . . Microcontroller

U. . . Comparators

R1. . . First resistance

R2. . . Second resistance

VR. . . Variable resistance

U0~U7. . . Shift register

D0~D7. . . Eight-segment digital tube

T. . . Transistor

LS. . . buzzer

1 is a block diagram of a preferred embodiment of a power test system of the present invention.

2 is a circuit diagram of a preferred embodiment of a power test system of the present invention.

100. . . Control input module

200. . . Voltage regulation module

300. . . Load regulation module

400. . . Power supply module

500. . . Power Supplier

Claims (8)

A power supply testing system for performing an overcurrent protection test on a power supply system includes a control input module, a voltage regulation module, and a load adjustment module, the control input module including at least one switch And a corresponding test current is provided, the control input module outputs a pulse width modulation signal according to the test current selected by the switch, the voltage adjustment module receives the pulse width modulation signal, and outputs a specific size according to the pulse width modulation signal. The first DC voltage of the direction supplies power to the load regulation module, and the load adjustment module receives the first DC voltage, and adjusts a load of the power supply according to the first DC voltage to adjust a current thereof. The power supply test system of claim 1, wherein the control input module further comprises a microcontroller, the microcontroller comprising at least one current signal input end and a pulse width modulated signal output end, the switch end The current signal input terminal is electrically connected, and the other end of the switch receives a second DC voltage. When the switch is closed, the microcontroller outputs the pulse width modulation signal at the pulse width modulation signal output end. The power supply testing system of claim 2, wherein the voltage regulating module comprises a voltage regulating chip and a transistor, the voltage regulating chip comprises a first control signal input end and a second control signal input end. a pulse width modulation signal input terminal, a first output terminal, and a second output terminal, the microcontroller further includes a control signal output terminal, the first control signal input terminal receiving the second DC through a first resistor a voltage, the second control signal input end is electrically connected to the control signal output end, and the base of the transistor is electrically connected to the control signal output end via a second resistor, and the collector of the transistor is electrically connected to the first The first signal output terminal is electrically connected to the pulse width modulation signal output terminal, and the first output terminal and the second output terminal output the first DC voltage. The power supply test system of claim 3, wherein the load adjustment module comprises a motor, one end of the motor is electrically connected to the first output end, and the other end of the motor is electrically connected to the second output end for receiving The first DC voltage. The power supply test system of claim 4, wherein the load regulation module further includes a first diode, a second diode, a third diode, and a fourth diode. The cathode of the first diode is electrically connected to one end of the motor and the anode of the fourth diode, the anode of the first diode is grounded, and the cathode of the fourth diode receives the second DC voltage, the first The cathode of the triode is electrically connected to the other end of the motor and the anode of the second diode. The anode of the third diode is grounded, and the cathode of the second diode receives the second DC voltage. The power supply test system of any one of claims 3 to 5, wherein the switch is a push button switch, and the transistor is an NPN type transistor. The power supply test system of any one of claims 1 to 5, wherein the power test system further includes a power supply module that converts an alternating current voltage into the second direct current voltage. The power supply test system of claim 7, wherein the second DC voltage has a magnitude of +5V.